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Old 12th March 2009, 11:42 PM   #21
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Thumbs up Thanks

thanks so much hotiron and anbello...yes I do have limited knowledge in the digital field and I would love to learn more... I was a bit confused from anbello's description.....but thanks for clearing it up... i will try it today sometime
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Old 13th March 2009, 09:07 AM   #22
anbello is offline anbello  Italy
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I'am sorry if i'am not able to explain well this stuff but i have some problems with the english language.
Anyway referring to schematic attached in the first post if you want try it without reclocking (74HC4040 and Crystal Oscillator removed) i wrote: "you have to change the 8414 from mode 3 (M0=1, M1=1, M2=0, M3=0) to mode 2 (M0=0, M1=1, M2=0, M3=0)" that means change pin 23 from +5V to GND, pin 13 could be also floating (not connected to anything - as it is when you remove the 74HC4040).
If you would like to understand better the various modes of functioning of the CS8414 you can read page 21 of the datasheet, it's enough to google for "cs8414 datasheet" or click here:
http://freenet-homepage.de/kxdev/docs/codecs/8413-4.pdf

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Old 13th March 2009, 10:23 PM   #23
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Unhappy is that smoke

.....I tied pins 23 and 13 to ground (no 74hc4040 or crystal ), but when I powered it up the power on led was dim then a couple of seconds later it started smoking from the rectifier diodes!...anyway I got to it in time ..changed back to original circuit and was ok.
When I looked at the original cct in the first post ( analogmetric dac kit )...it shows 5vdc to pin 23...so I was creting a dead short !.....tell you what those lm317 regs are pretty tough!....did you mean to float the 5vdc to pin 23 then short pin 23 to gnd??
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Old 13th March 2009, 10:35 PM   #24
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Smile pic of my dac

this is my dac...might help
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File Type: jpg tda1541_nos_006.jpg (60.7 KB, 352 views)
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Old 13th March 2009, 10:37 PM   #25
anbello is offline anbello  Italy
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Default Re: is that smoke

Quote:
Originally posted by Chilli6565
.....I tied pins 23 and 13 to ground (no 74hc4040 or crystal ), but when I powered it up the power on led was dim then a couple of seconds later it started smoking from the rectifier diodes!...anyway I got to it in time ..changed back to original circuit and was ok.
When I looked at the original cct in the first post ( analogmetric dac kit )...it shows 5vdc to pin 23...so I was creting a dead short !.....tell you what those lm317 regs are pretty tough!....did you mean to float the 5vdc to pin 23 then short pin 23 to gnd??

You have to disconnect pin 23 from +5V and connect it to GND, maybe you can bend the leg of the adapter corresponding to pin 23 (is 8414 mounted on an adapter?) to go out of his socket and connect it (the leg) to GND.

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Andrea
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Old 13th March 2009, 10:44 PM   #26
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Default ok

thanks Andrea....I thought that might be the solution...will try today or tomorrow....
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Old 13th March 2009, 11:30 PM   #27
anbello is offline anbello  Italy
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You're welcome,
anyway i explained you how to set your DAC without reclocking because it seemed to me that it was what you want to try and not because i think it's better, simply try and let us know your impressions.
The kind of reclocking implemented in your DAC has pros and cons, it lower the jitter but you have some samples slipped or repeated every now and then (this comes from the fact that you have two asynchronous clock with frequency very close to each other but not equal, one in the transport and one in the DAC).
Someone says that this effect is unnoticeable and you have only the pros of low jitter, other says that with NOS DAC, that are more tolerant to jitter, you don't need to reclock.
As i said try and choose the solution you like more.

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Old 14th March 2009, 12:59 AM   #28
hotiron is offline hotiron  Scotland
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I can only apologize chilli6565 I stupidly assumed you would know that these pins were tied to VDD!!!!! I now feel very bad and look like a knob.
You need to look at the two schematics this is common sense>
What ye thinkin about?
I am listening to ZZTop El Rancho right now .super modded rotel 855 tda 1541
and it is kicking ***> I would offer to fix yours if you were not at the other side of the planet.


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Old 14th March 2009, 01:15 AM   #29
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Thumbs up no problemo

hotiron....I should have looked at the cct before I did the mod...man, it must be late there...its lunchtime here....

later....
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Old 14th March 2009, 02:35 AM   #30
hotiron is offline hotiron  Scotland
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Yip its 2:30 AM I'm listening to Evanesence now and its wicked. I'm on the amber nectar.
Where abouts in OZ are you? could be the perfect excuse to get away for bit I have several friends down there that need looking up!!!
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